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Breast tissue infiltration by neoplastic lymphoid population (A, asterisk: mammary duct), consisting of small to medium-sized cells (B), some of which present plasmacytoid features (B), immunoreactive to PAX5 (C), CD5 (D), CD23 (E) and kappa light chains (F) antibodies. HE staining: (A) ×20; (B) ×400. Immunohistochemistry: (C–E) ×100; (F) ×40. PAX5: Paired box protein 5; CD: Cluster of differentiation; HE: Hematoxylin–Eosin
